<template>
  <div class="cmt-container">
    <h3>发表评论</h3>
    <hr>
    <textarea placeholder="请输入要BB的内容（做多吐槽120字）" maxlength="120" v-model="msg"></textarea>

    <mt-button type="primary" size="large" @click="postComment">发表评论</mt-button>

    <div class="cmt-list">
      <div class="cmt-item" v-for="(item, i) in comments" :key="item.content">
        <div
          class="cmt-title"
        >第{{ i+1 }}楼&nbsp;&nbsp;用户：{{ item.user_name }}&nbsp;&nbsp;发表时间：{{ item.add_time | dateFormat }}</div>
        <div class="cmt-body">{{ item.content === 'undefined' ? '此用户很懒，嘛都没说': item.content }}</div>
      </div>
    </div>

    <mt-button type="danger" size="large" plain @click="getMore">加载更多</mt-button>
  </div>
</template>
<script>
import { Toast } from "mint-ui";
export default {
  data() {
    return {
      msg: "",
      comments: [], // 所有的评论数据
      data1: [
        { user_name: "张1", add_time: new Date(), content: "哈哈哈1" },
        { user_name: "张2", add_time: new Date(), content: "哈哈哈2" },
        { user_name: "张3", add_time: new Date(), content: "哈哈哈3" },
        { user_name: "张4", add_time: new Date(), content: "哈哈哈4" },
        { user_name: "张5", add_time: new Date(), content: "哈哈哈5" }
      ],
      data2: [
        { user_name: "李1", add_time: new Date(), content: "666555" },
        { user_name: "李2", add_time: new Date(), content: "66612" },
        { user_name: "李3", add_time: new Date(), content: "666478" },
        { user_name: "李4", add_time: new Date(), content: "66699" },
        { user_name: "李5", add_time: new Date(), content: "66655" }
      ]
    };
  },
  created() {
    this.getComments();
  },
  methods: {
    //获取评论
    getComments() {
      this.comments = this.data1;
    },
    postComment() {
      //trim 去除字符串的头尾空格
    //   console.log(this.msg);
      if (this.msg.trim().length === 0) {
        return Toast("评论内容不能为空");
      }
      // 1. 拼接出一个评论对象
      var cmt = {
        user_name: "匿名用户",
        add_time: Date.now(),
        content: this.msg.trim()
      };
      this.comments.unshift(cmt);
      this.msg = "";
    },
    getMore() {
      //加载更多
      this.comments = this.comments.concat(this.data2);
    }
  }
};
</script>
<<style lang="scss" scoped>
.cmt-container {
  h3 {
    font-size: 18px;
  }
  textarea {
    font-size: 14px;
    height: 85px;
    margin: 0;
  }

  .cmt-list {
    margin: 5px 0;
    .cmt-item {
      font-size: 13px;
      .cmt-title {
        line-height: 30px;
        background-color: #ccc;
      }
      .cmt-body {
        line-height: 35px;
        text-indent: 2em;
      }
    }
  }
}
</style>

